elementary mesons
a kind of particle without detectable mass or charge
exchanges of energy on the order of millions of electron volts
another set of elementary particles
27. The passage speaks of particles as having conditional elementarity if they
remain unchanged at given level of energy exchange
cannot be decomposed into smaller constituents
are mathematically simpler than some other set of particles
release energy at a low level in collisions
belong to the nuclear level on the quantum ladder
答案:17-27:ACEBDBCABEA
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